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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d0c1aaba218a3e018bc193a0ef30a304a7f63cc6dd6bd159c2f5bbebd46ad2' 
  AND token = 'Q/NYiSr/ChK1r1m67/68vDgNnMH82tan21ArVqufhzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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