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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b74080e915c0982da13eb77f75cd100d22590d003c56fe4db739bd52cf405f' 
  AND token = 'qN4d7Ir6oPJgZwK7xJ7EVyufOlEQ9RWNlfz1Ess1wa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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