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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0eaad375fd29b3fee69fa8fde627b5295d31749ea08b966394add95a5e12f5' 
  AND token = 'JfYo+v0RaxtjIa3WfFc8xsvTKy85itR1RQhd/A2yEWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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