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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ea5f1f71d9d28e37153746db8b2b976e1fcb7c83d2f25ebe23b86853654bb2' 
  AND token = 'azf0IYEXZQ0qsP9CoxqbhymvqoR6cOQpnQ0n3fLtjT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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