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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1940c19b0b0f137df14d8bbb8060c2ed8d4e9ea3c2b0091db8463074149897e6' 
  AND token = 'aqBbxe/JmTPp/MbFPDhpBW3VUrNSo28heRdm8B3+kNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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