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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1c7cb914bd8a5d2fcfd2c4bfab2d40a86049f03a075a68c49aa0ab1562bc7a' 
  AND token = '172oGNpG+oe6zCsLqjOM41+TZhAbtuU1/Glzz9aC1fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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