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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912b67e1516e4e5ac5a92421f0ec9183948f276a036633016d9250fbe1fe1ee2' 
  AND token = 'QOetHgE1UKcSxsPDOlgGGKg0HP531VfedWIHov+CCq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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