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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84a2003783738f77f5941d41595f27440bdaa14f11474eb02caf972ef9b28ea' 
  AND token = 'RpoPvEjN041EG+l9hZ67E81j+uJh27gTFTGebi4vPQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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