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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c45e4f8a4b08a35ad58f7cd8a7e14e33d41f9032f1d6a8864dbb3d51415e71a' 
  AND token = '7r3lxIl5LoABjy1PRktRUPqLDhPS2OS3joB1Lfp4YbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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