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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e971bf15bd8d2d4c223a92d20491c36f456a2cf0da481cc92042362cf3065cd' 
  AND token = 'h+KOCJUwhxjrLDaEg50ijadpRG9rRfBuXGD0+e1kEfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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