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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515d9d09dc0e84cdd4987a9a4b25e6b678511632f6baa47b440060b866530bd2' 
  AND token = 'Hg+3wfV4WC0hWwRWeGfG3lc8N7oIVP5acHog75cMJcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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