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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5e9d4432d86bd6732a159235f2662fc008f62e92ed5357d692fb21b882a4f0' 
  AND token = '1INg2cPdVjq0tw69UV2tNSWm7w3yC4WH+Vq2wAyUrnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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