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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7db4490a4c2942d227892a183f0fcec3d16948eda3ae3d6ef7c9a0f8fb224c4' 
  AND token = 'fzXRqQIeQIIq8UgWGRDVzLMHk0BQM1I5e3ks7Gv67uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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