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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581fe92bcff0aaf9f91b52bce3434765a8f3a7de2333b3ce7f55ffddf887309d' 
  AND token = 'q46KiJtrN/rG0ae3OPYr7oGpq4uiGOZzs1g3JahHoUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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