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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e761df9ac694cef9b0f4e8e5e398a57c45af294836f26c2b68b8cac5e9c3d54c' 
  AND token = 'Vtdc3cNfMccbdbmdVwsEDSiqWF3ntHBR2jV7eAbHzyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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