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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c835f46057d1201d16acc8ea9086142c8d340110dfc7753d4f0dd4c36f687fa2' 
  AND token = 'EvuaikI5l4Bad5VuYDlltthIoHBwlmJ4PNrq0KB/2d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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