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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a2e3e2818beeb4c92c19e2ce3331a7802cb0fb0ed3307d137c2d2ab017a13d' 
  AND token = 'n55ojo1UDCnHahIVYtX+HoUSmc7n/ne8fTg474GPdh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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