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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32674680c4ae101dc7a04bee211af629e011cca7361d37126172265f08bee6a6' 
  AND token = 'w0TOhilLSREwTDL9uVUlx/nNz17TgceVYtJbkmzTffM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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