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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde3b7a1aaed20dcab6fe3fbe433ea15fe3e92179c0a251a8f5409fc524ecf1b' 
  AND token = 'ist/lxv87gnmPhxgMpDZ79s9ksUpkyUjkeOBqAZ3VSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}