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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19481954634d8a3fe4dea3e5cdf72dc0bd32b775a17b000158c56e6bf196e28' 
  AND token = 'cU3s1C1gtwyRHi2DZ6LbmAEAECrH4Fd4X623ibWQMZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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