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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b461b6771329eecae98f1a4fca2b856c5e8b3684fcaa81d2ef61398d8a314b' 
  AND token = 'LHV8ISDu9uo7zz8C8Xrfp57OAmo53EWNnfhVpYM9d2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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