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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1462d9d173f81947a0245b6a41dd74d92b06c52f4b0c2f40acdc9200f56884b' 
  AND token = 'TXLefsU35DBR0HCdhBJ6omfvPtnnPOaJ9NngebrPk6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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