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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72a38a7ac2eec8f5f97387338b4730b0aca3984a0d3562afcc677cb3cd5b30d' 
  AND token = 'RYXXi6lVTZybvJlkR1TcY6emslDOAALd/pO2N1A5aQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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