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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f669a6686779d95ab7d39627c02c85d5509ca80506d4fc338ea05afe8dd10183' 
  AND token = 'Doaj+ebtJ1WQFjTeLp4pXNZkI4yY5DLwxKJjDYttM18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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