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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9cde95b22fef6ef9588ce313438d9dce7562f0c23ad1f5b1da946a52cb110c' 
  AND token = 'OhQCi7btJ2u5h84uAkMUZdMee7HcvZXCzYiMGWo83Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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