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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26836187f1a666ad80e276c8c82ad8470907379e51fdd76555cc5507640b9e66' 
  AND token = 'cYwA3BPlxfVEpqxVAb5f4ugL7nxAUWth+EK/DQ0QO1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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