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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfe7f4ea6e3b1fcb27d13a4189ddea3b4d8fda71e33c607f96e36ddc3b7fd28' 
  AND token = 'oeTeT+MzmZFKk/UBYkqZb73M3fu34LWnTshA4o95r0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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