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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9dfd741a594fd24ab8324c61e2fd8e54ae62d7ad9a8eb0a96dd694f955bbc7' 
  AND token = 'kn/69/5qpGiCq24nQ/fK2a01AaQF5X1tdYO+yUnFdrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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