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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e3ad232a06a4fe0aeb565d5cd0265bee475a0a0ca2f8ff3cea71d68ec64cd7' 
  AND token = 'sjCjBkJ/L/NRxttnWZkpgVEkwRDBUZ5UdIM5ezAUZZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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