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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0da89a3fad0f60347ac3169c5bdb9fd088e24fe3393071d92335b3ccae4e62' 
  AND token = 'tjke1UxHMuVHsFpFKd+Xw1IJxda50sUnAabCXig/nH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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