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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8403108d4ad405858ba20a4ebadc912572ac79ac0c5db78926885cf1f572162f' 
  AND token = 'uqpLa+Gp/uO29cyMuRHC/joPe44ECv6FyM+Txm3sdsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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