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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42242f08a9316e06c637fcf931ffae947b200082671263e741c26a64cbb019e7' 
  AND token = '83CA+O9wHj2wzJpRTEsOs3BysLzM8Brd3c77FVxxNik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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