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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f674bf5aa4807b3f268531b70f47343061247d3acd0b43c47c1098b77d36b9f' 
  AND token = 'wXIOjs3FA17lyjsf2ohXjJHWPnkUSkAaVlBIm9vseko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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