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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d332541f16f0e9b01265b9d6926dfc625d6e81cb919698c6e73a73ec964ef4f' 
  AND token = 'm5VF9K1AqqoXb+nJqzUqv00PjHmKxLclO26/PyyOvd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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