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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04de8847fc50f2483f677bcb89d15160ee52d1940a7af33f8a93911b472ec2dc' 
  AND token = 'yIe4x99RixEK5EIfEcVw9iFlUJJP+gnM1reDjbndp54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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