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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb650ba458ed0ef887f897ca5bea7f5f232c5856080ed7e6e6e9877bbf00a3ff' 
  AND token = 'UKO7MOV26c29PGnsFPstc6mX9dIp/u8ar0WTm7SzOGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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