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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec920175bc1acee83c343d1fa4dbeb4620dab4c315fb71b5bf4a1fea717efec' 
  AND token = 'gDv1OQhzE6T+eBMeYJKP/gHgU0MPBhoEmazQUf3BhIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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