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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807d9cd70acdda52313f061e8a057b883b1ab15498f2675ac1b6877b569ef98f' 
  AND token = 'J73bEGSIQJ7yUYYS6Z1X1iR6jWp561eEWcyp1+NR2bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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