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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32977dc8ab5442d53274d689fe8c4317c4f9d5676f009ce1821de1b6bc5568f' 
  AND token = 'ZRi1sDAmPbPodx85eR5pDuWf8HLcoWJTVPypQdQMEiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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