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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf010a0e5c81b124475fa176f4a8b8b8ec5719702cfd88be07d8e4d0c94d3722' 
  AND token = 'EenP5lorguMeXI6YbjbdlUGoaYfaInr9SPU8Khs1iMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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