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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2691655206e95512363ecee646030d5140a05375c1c39a7506fc1db14e2b559e' 
  AND token = 'eS1eVHt2Bi5T6Rw2L5DxmWNoG8D1prEfGDEbRd4BZ68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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