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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097db265c46e6b1c6da2fd03d3d76da4065feb34f8e9f20c29bd74e94fbadb7a' 
  AND token = '3aKjHzPEEsxoUOoFu1E4xoHoIqxMr5jUGPtxkfFnV9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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