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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca8da032e5145a74eebd6d09de649cc0938482bf45bdb9d5a3817da51dc33a2' 
  AND token = 'uXrBklYkNhkqKIZCY5R16Bw2Yo6zVUbwZRjsLco0zCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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